Shopify Expert

query getProducts($first: Int!, $after: String) {
  products(first: $first, after: $after) {
    edges {
      node {
        id
        title
        handle
        descriptionHtml
        metafields(first: 10) {
          edges {
            node {
              namespace
              key
              value
              type
            }
          }
        }
        variants(first: 10) {
          edges {
            node {
              id
              title
              price
              inventoryQuantity
              selectedOptions {
                name
                value
              }
            }
          }
        }
      }
      cursor
    }
    pageInfo {
      hasNextPage
      hasPreviousPage
    }
  }
}

// extensions/custom-discount/src/index.js
export default (input) => {
  const configuration = JSON.parse(
    input?.discountNode?.metafield?.value ?? "{}"
  );

  // Apply discount logic based on cart contents
  const targets = input.cart.lines
    .filter(line => {
      const productId = line.merchandise.product.id;
      return configuration.productIds?.includes(productId);
    })
    .map(line => ({
      cartLine: {
        id: line.id
      }
    }));

  if (!targets.length) {
    return {
      discounts: [],
    };
  }

  return {
    discounts: [
      {
        targets,
        value: {
          percentage: {
            value: configuration.percentage.toString()
          }
        }
      }
    ],
    discountApplicationStrategy: "FIRST",
  };
};

{% comment %}
  sections/featured-collection.liquid
{% endcomment %}

<div class="featured-collection" style="background-color: {{ section.settings.background_color }};">
  <div class="container">
    {% if section.settings.heading != blank %}
      <h2 class="featured-collection__heading">{{ section.settings.heading }}</h2>
    {% endif %}

    {% if section.settings.collection != blank %}
      <div class="featured-collection__grid">
        {% for product in section.settings.collection.products limit: section.settings.products_to_show %}
          <div class="product-card">
            {% if product.featured_image %}
              <a href="{{ product.url }}">
                {{
                  product.featured_image
                  | image_url: width: 600
                  | image_tag: loading: 'lazy', alt: product.title
                }}
              </a>
            {% endif %}

            <h3 class="product-card__title">
              <a href="{{ product.url }}">{{ product.title }}</a>
            </h3>

            <p class="product-card__price">
              {{ product.price | money }}
              {% if product.compare_at_price > product.price %}
                <s>{{ product.compare_at_price | money }}</s>
              {% endif %}
            </p>

            {% if section.settings.show_add_to_cart %}
              <button type="button" class="btn" data-product-id="{{ product.id }}">
                Add to Cart
              </button>
            {% endif %}
          </div>
        {% endfor %}
      </div>
    {% endif %}
  </div>
</div>

{% schema %}
{
  "name": "Featured Collection",
  "tag": "section",
  "class": "section-featured-collection",
  "settings": [
    {
      "type": "text",
      "id": "heading",
      "label": "Heading",
      "default": "Featured Products"
    },
    {
      "type": "collection",
      "id": "collection",
      "label": "Collection"
    },
    {
      "type": "range",
      "id": "products_to_show",
      "min": 2,
      "max": 12,
      "step": 1,
      "default": 4,
      "label": "Products to show"
    },
    {
      "type": "checkbox",
      "id": "show_add_to_cart",
      "label": "Show add to cart button",
      "default": true
    },
    {
      "type": "color",
      "id": "background_color",
      "label": "Background color",
      "default": "#ffffff"
    }
  ],
  "presets": [
    {
      "name": "Featured Collection"
    }
  ]
}
{% endschema %}

// assets/cart.js

class CartManager {
  constructor() {
    this.cart = null;
    this.init();
  }

  async init() {
    await this.fetchCart();
    this.bindEvents();
  }

  async fetchCart() {
    try {
      const response = await fetch('/cart.js');
      this.cart = await response.json();
      this.updateCartUI();
      return this.cart;
    } catch (error) {
      console.error('Error fetching cart:', error);
    }
  }

  async addItem(variantId, quantity = 1, properties = {}) {
    try {
      const response = await fetch('/cart/add.js', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({
          id: variantId,
          quantity: quantity,
          properties: properties,
        }),
      });

      if (!response.ok) {
        throw new Error('Failed to add item to cart');
      }

      await this.fetchCart();
      this.showCartDrawer();
      return await response.json();
    } catch (error) {
      console.error('Error adding to cart:', error);
      this.showError(error.message);
    }
  }

  async updateItem(lineKey, quantity) {
    try {
      const response = await fetch('/cart/change.js', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({
          line: lineKey,
          quantity: quantity,
        }),
      });

      await this.fetchCart();
      return await response.json();
    } catch (error) {
      console.error('Error updating cart:', error);
    }
  }

  updateCartUI() {
    // Update cart count badge
    const cartCount = document.querySelector('.cart-count');
    if (cartCount) {
      cartCount.textContent = this.cart.item_count;
    }

    // Update cart drawer content
    const cartDrawer = document.querySelector('.cart-drawer');
    if (cartDrawer) {
      this.renderCartItems(cartDrawer);
    }
  }

  renderCartItems(container) {
    // Render cart items in drawer
    const itemsHTML = this.cart.items.map(item => `
      <div class="cart-item" data-line="${item.key}">
        <img src="${item.image}" alt="${item.title}" loading="lazy">
        <div class="cart-item__details">
          <h4>${item.product_title}</h4>
          <p>${item.variant_title}</p>
          <p class="cart-item__price">${this.formatMoney(item.final_line_price)}</p>
          <input 
            type="number" 
            value="${item.quantity}" 
            min="0" 
            data-line="${item.key}"
            class="cart-item__quantity"
          >
        </div>
      </div>
    `).join('');

    container.querySelector('.cart-items').innerHTML = itemsHTML;
    container.querySelector('.cart-total').textContent = this.formatMoney(this.cart.total_price);
  }

  formatMoney(cents) {
    return `$${(cents / 100).toFixed(2)}`;
  }

  showCartDrawer() {
    document.querySelector('.cart-drawer')?.classList.add('is-open');
  }

  bindEvents() {
    // Add to cart buttons
    document.addEventListener('click', (e) => {
      if (e.target.matches('[data-add-to-cart]')) {
        e.preventDefault();
        const variantId = e.target.dataset.variantId;
        this.addItem(variantId);
      }
    });

    // Quantity updates
    document.addEventListener('change', (e) => {
      if (e.target.matches('.cart-item__quantity')) {
        const line = e.target.dataset.line;
        const quantity = parseInt(e.target.value);
        this.updateItem(line, quantity);
      }
    });
  }

  showError(message) {
    // Show error notification
    console.error(message);
  }
}

// Initialize cart manager
document.addEventListener('DOMContentLoaded', () => {
  window.cartManager = new CartManager();
});

mutation CreateMetafieldDefinition($definition: MetafieldDefinitionInput!) {
  metafieldDefinitionCreate(definition: $definition) {
    createdDefinition {
      id
      name
      namespace
      key
      type {
        name
      }
      ownerType
    }
    userErrors {
      field
      message
    }
  }
}

{
  "definition": {
    "name": "Size Guide",
    "namespace": "custom",
    "key": "size_guide",
    "type": "multi_line_text_field",
    "ownerType": "PRODUCT",
    "description": "Size guide information for the product",
    "validations": [
      {
        "name": "max_length",
        "value": "5000"
      }
    ]
  }
}

// app/routes/app.proxy.jsx
import { json } from "@remix-run/node";

export async function loader({ request }) {
  const url = new URL(request.url);
  const shop = url.searchParams.get("shop");
  
  // Verify the request is from Shopify
  // Implement signature verification here
  
  // Your custom logic
  const data = await fetchCustomData(shop);
  
  return json(data);
}

export async function action({ request }) {
  const formData = await request.formData();
  const shop = formData.get("shop");
  
  // Handle POST requests
  const result = await processCustomAction(formData);
  
  return json(result);
}

# Theme Development
shopify theme init                    # Create new theme
shopify theme dev                     # Start development server
shopify theme push                    # Push theme to store
shopify theme pull                    # Pull theme from store
shopify theme publish                 # Publish theme
shopify theme check                   # Run theme checks
shopify theme package                 # Package theme as ZIP

# App Development
shopify app init                      # Create new app
shopify app dev                       # Start development server
shopify app deploy                    # Deploy app
shopify app generate extension        # Generate extension
shopify app config push               # Push app configuration

# Authentication
shopify login                         # Login to Shopify
shopify logout                        # Logout from Shopify
shopify whoami                        # Show current user

# Store Management
shopify store list                    # List available stores

theme/
├── assets/                   # CSS, JS, images, fonts
│   ├── application.js
│   ├── application.css
│   └── logo.png
├── config/                   # Theme settings
│   ├── settings_schema.json
│   └── settings_data.json
├── layout/                   # Layout templates
│   ├── theme.liquid
│   └── password.liquid
├── locales/                  # Translations
│   ├── en.default.json
│   └── fr.json
├── sections/                 # Reusable sections
│   ├── header.liquid
│   ├── footer.liquid
│   └── featured-collection.liquid
├── snippets/                 # Reusable code snippets
│   ├── product-card.liquid
│   └── icon.liquid
├── templates/                # Page templates
│   ├── index.json
│   ├── product.json
│   ├── collection.json
│   └── customers/
│       └── account.liquid
└── templates/customers/      # Customer templates
    ├── login.liquid
    └── register.liquid